A better way of terminating all Service-Broker activity in a given database:
ALTER DATABASE [dbName] SET NEW_BROKER WITH ROLLBACK IMMEDIATE;
See:
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SQL Server 2016 Columnstore Index Enhancements - System Views for Disk-Based Tables[/url]
Persisting SQL Server Index-Usage Statistics with MERGE[/url]
Turbocharge Your Database Maintenance With Service Broker: Part 2[/url]